Desenvolvimento de método espectrofotométrico para análise de paraformaldeído em saneantes comerciais e industriais
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Abstract
O presente artigo descreve uma metodologia espectrofotométrica para a análise de paraformaldeído presente em amostras de saneantes comerciais e industriais, utilizando-se ácido cromotrópico (ACT), ácido clorídrico concentrado e peróxido de hidrogênio, produzindo um composto púrpura - avermelhado (l max = 575 nm). A lei de Beer é obedecida numa faixa de concentração de 0,8 - 4,8 mg L-1 em formaldeído, apresentando excelente coeficiente de correlação (r = 0,9999). Os valores obtidos nas análises concordaram muito favoravelmente com os obtidos pelo procedimento padrão recomendado pelo NIOSH (National Institute for Occupational Safety and Health).
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